Furnace for steam-boilers.



G. A. BU MILLER. I FURNACE FOR STEAM BOILERS.

APPLIQATION FILED SEPT. 17. 1908,

911,473, I Y Patented Feb. 2,1909

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A. BIT MILLER.

Patented Feb. 2, 1909 2 SHEETSSHEET 2.

FURNACE FOR STEAM BOILERS. APPLIUATION FILED SEPT. 17. 1908.

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Specification 6r Letters Patent.

Patented Feb; 2, 1969.

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Twit a mayeoacem- I e 15 it seem that I, rust Mates,

of Pittsburg, in the toasty er Aueghehyaad State of Pennsylvania, have invented certain new and useful Iinprovenrentsin Furnaces for Steam-Boilers, of which the following is a specification. 1 I I his avenu s relates to anew and its-- proved furnace for steain boile'rs and a the prime objects of my iiivention a're, to iiicrease theefficiehey of furnaces of this class and to prevent the escape of'smoke. 1

In the accompanying drawings. which illustrate applications of my invention, Figure 1 is a longitudinal sectional view of a furnace constructed eased-ease with my invention showing a boiler in sideelevat-ien; Fig. 2 a vertical t ransverse. se'cjt a longitudinal seen" I g casting, the section being takes eii line 33 of Fig. 4:; *Fig. 4 a vertical section of the grated-casting; Fig. 5 an elevational view of a supporting-casting Fig. 6 a vertical sectional view of the supporting-casting; and Fig. 7 a diagrammatic view showing an embodiment of my invention with an inclined grate.

Referring to the drawings, the furnace, as illustrated and as preferred, comprises the side-walls 2 and a rear bridge-wall 3 designed to support a boiler 4. The walls 2, as well as the rear-wall 3, are cut-away or recessed as shown at 5, thus forming a recess in each of said walls extending above and'below the fire-bars or grate 6. The front of the grate illustrated is supported by the front wall of the furnace and its rear on the projection 7 Located in the recesses 5 of each of the walls and arranged flush with the surfaces of said walls, I employ a supporting-casting 7 and a grated-casting 8. In practice these castings are made in sections of any desired length, although a single supporting-casting and a single grated or ventilating-casting may be employed in each recess. 'ihe supporting-castings 7 comprise a base-portion 9, an inclined plate or portion 10, upright endmembers 11, and a partition-wall or member 12. This construction provides in each casting two air-ducts orpassages 13, formed by the sloping or inclined plate, the end-members and the dividing-wall 12. Said ducts or passages 13 are in open-communication with the ash-pit 14 of the furnace below the grate and are designed to permit heated air from the ash-pit to pass up to and through the grated or ventilating-casting 8 and per- Init the ashes from the fuel bed to pass through saidsupporting-casting to the ashpit. In addition to the parts mentioned, the supporting-castings are formed with end and eentralengaging-liigs 15 designed to engage the grated castings when the latter are placed position on the lower or supporting caste's- .5

, The or gratedcastings, as preferred,.jeach comprises atop-member 1 6 having a flangedortion 17, a bottom-member 18, end-meii ers 19, central-member 20, saidend-inembers and eentral-inember joiniagu e top seed beaomaiembes, and a series ersaaeauy seeming eaves ar a tarefi e w estles 2 2.; 5111 ts as sq; tgea aanafi erg a rears "entrees ea a new ei pieg a 11-1 ating said er plates fieHi beiiig burned away or destroyed by theburning fuel in contact therewith. The lower-member of casting 8 is cutaway, as shown, to form an air-passage 22 for the passage of air from the air-ducts 13 of the supportingcastings.

The admission of air to the side gratedcastings .may be regulated by means of dampers. As shown, I employ a series of dampers 23 mounted on a rod 24 and arranged to control the passage of air from the ash-pit to the ducts of the supporting-castings. The base portion 9 of the supporting-casting is arranged below the furnace grate and the inclined portion extends upwardly from the base to the top of said casting or to the grated-casting. By forming the grated-casting with the passage 22 in its bottom member, and arran ing said passage or opening in register with t e 1passages 13 of the supporting-casting any as es and other matter that may be passed through the grated-casting from the bed of fuel, will slide down the inclined wall 10 of the passage or passa cs 13 and be discharged into the ashpit be ow the grate. With this construction there is no danger of the air-passages becoming clogged or stop ed up as has heretofore been the case in 'urnaces of the class to which my invention relates.

What I claim is:

1. In a furnace the combination with a grate, a furnace wall formed with a recess extending above and below the grate, a supportingcasting in the recess comprising a base portion and an inclined plate extending upwardly and rearwardly from the inner edge of the base ortion and arranged to form a passage at t e side of the grate, said passage being in communication with the ashit below the grate, and a grated casting on t e supporting-casting having its base cut away to form a passage registering with the first mentioned passage.

2. In a furnace the combination with a grate, side walls-each formed with a recess extending above and below the grate, of a supporting-casting in each recess comprising a base portion located below the grate and an inclined portion extending from the base to the top of said casting arranged to form passages at the sides of the grate, said passages in communication with the ash-pit below the grate, and a grated casting resting upon each of the supporting-castings and formed with a passage registering with the passage of its supporting-casting.

3. In a furnace the combination with a grate, a furnace wall formed with a recess exand a grated casting resting upon the supporting-casting comprising a top-member, a

LOt'tOIll-lIlQl'llbGI, and a series of curved and low the grate bars, an inclined portion extending upwardly from the base portion, said supporting-casting arranged to form. a passage between the grate and its inclined portion, a removable grated-casting resting upon the supportingcasting and having its base cut away to form a passage registering with the first mentioned passage thereby forming a passage from below the grate-bars to the bed of fuel on the grate-bars.

In testimony whereof I aliix my signature in presence of two witnesses.

GEORGE A. BU ldILLEli.

lVitnesses STELLA It. BULHART, W. G. DOOLITTLE. 

